When I worked for startups I had to change hats constantly. At the time I could switch my brain over to a new, unrelated task pretty easily... one minute you're writing, the next you're negotiating ad prices, then you're looking at art comps, and then you're picking up Jamba Juice. (I always got the Jamba Juice runs.) It was all part of the job. You would think that working in marketing would make the selling aspects of creative writing - writing the query letter, pitch, synopsis, etc. - easier but it's not! I figure part of it is because my brain was then. Nowadays, I find I have to make a major brain switch, and sometimes pretend I'm someone else, to do it.
(Actually, I think it would be much easier for me to write a query letter and pitch for a client than for myself. Not that I'm offering! (Although, hmmm... I bet there are enterprising writers out there making a living writing pitches for authors. Writer for writers for hire.))
Anywho, I am doing it. I've written the pitch, the query letter, and a synopsis (that I am almost happy with). Usually I need a bit of a break from creative writing and a lot of research before I feel back in the marketing mindset, and maybe a little bit of minor panicking. These are the times that I miss school deadlines. Or actually, any authoritative voice giving me a deadline, because apparently I don't listen to myself at all!
So I'm wondering, for those you who write or anyone who has to switch between creative and business, what are your tricks to get in the right mood? My main trick seems to be over-researching until I'm sick of the subject and then either 1) taking a hot shower or 2) going to sleep. I think it's the "relax and let your unconscious brain work on the problem" method. What yours?